UITableView需要双击-但不是第一次

我有一个UITableView，带有可以点击的单元格。当您点击时，会执行一些操作，但这在此情况下并不重要。第一次按下时，它可以正确处理水龙头。第二次运行代码，但是所有View更新（例如显示UIAlertView或显示新视图）都被延迟。但不要耽误时间-它在等我触摸屏幕。无论我在哪里按或等待多长时间，都只需按。而且，这是第一次。

我的TableView设置为单选，而不显示触摸时的选择。任何想法为什么要这样做？

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    if ([cell isKindOfClass:[DetailTableViewCell class]]) {
        DetailTableViewCell *detailCell = (DetailTableViewCell *)cell;
        NSString *hourString = [detailCell hourString];
        if (!detailCell.booking) {
            NSDate *rightNow = [NSDate new];
            NSDate *cellDate = [self.currentDate dateWithHour:indexPath.row andMinutes:0];
            // Only allow future bookings (but allow people people to book within the hour)
            if([rightNow compare:[cellDate nextHour]] == NSOrderedAscending){
                [self performSegueWithIdentifier:@"roomBooking" sender:indexPath];
                return;
            } else {
                [[[UIAlertView alloc] initWithTitle:@"Error" message:@"We currently do not allow our users make bookings in the past" delegate:nil cancelButtonTitle:@"Gotcha" otherButtonTitles:nil] show];
                return;
            }
        } else if ([detailCell.booking hasPhoneNumber]) {
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"telprompt://%ld",(long)[detailCell.booking telephone]]]];
            return;
        } else {
            //TODO: FIND OUT IF BOOKING IS OWNED BY THE CURRENT USER
            [[[UIAlertView alloc] initWithTitle:@"Booking"
                                        message:[NSString stringWithFormat:@"You are now removing the booking at %@.", hourString]
                                       delegate:nil
                              cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
            @weakify(self);
            [self.room removeBookingWithId:[detailCell.booking.bookingId integerValue] andCompletion:^(BOOL success, NSError *error) {
                @strongify(self);
                if (success) {
                    @weakify(self);
                    [self.room.location updateBookingsWithCompletion:^(BOOL success, NSError *error) {
                        @strongify(self);
                        if (success) {
                            [self.calendar reloadData];
                        }
                    }];
                }
            }];
            return;
        }
    }
}